A torsional oscillator vibration isolation device and method based on suspension active control

Abstract

The application provides a torsion balance vibration isolation device and method based on suspension point active control, and belongs to the field of precise torsion balance experiments.The device comprises a vacuum container, a high-precision translation stage, a displacement measurement system and a controller.The vacuum container is used for maintaining a vacuum state inside the container to reduce the disturbance of the environment on the torsion balance.The vacuum container, the high-precision translation stage and the displacement measurement system are synchronous with ground vibration.When there is vibration on the ground, the vibrator in the torsion balance generates a displacement amount in response to the ground vibration, and the displacement measurement system is used for measuring the displacement amount of the vibrator in the horizontal direction.The controller is used for driving the high-precision translation stage to move with the vibrator by using a control signal according to the displacement amount of the vibrator in the horizontal direction.The application effectively reduces the influence of ground vibration on the sensitivity of the torsion balance system and improves the measurement level of the torsion balance system.

Description

Technical Field

[0001] This invention belongs to the field of precision torsion balance experiments, and more specifically, relates to a torsion balance vibration isolation device and method based on active suspension point control. Background Technology

[0002] Precision torsion balance systems, as a classic tool for detecting weak forces (torques), are widely used in experimental fields such as verifying fundamental physical laws, measuring weak physical effects, and detecting gravitational waves. Examples include experimental verification of Newton's inverse square law and equivalence principle, experimental verification of the photon's rest mass, precise measurement of the gravitational constant G, and precise measurement of the surface potential of metals. Precision torsion balance systems, relying on the extremely low torsional stiffness of their suspension wires, achieve a high sensitivity to forces or torques in the horizontal direction. In applications such as ground-based verification of space inertial sensors and ground-based stress wave detectors, the sensitive mass used to detect weak signals is suspended by the suspension wires of the torsion balance system. These applications typically require a measurement accuracy of at least 10⁻⁶. -12 m / s 2 The magnitude is approximately 10 due to the influence of solid tides and ground pulsations. The torsion balance system is inevitably affected by ground vibrations during application, with its level around 0.1 Hz. -7 m / s 2 This interferes with many similar torsion balance experiments. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a torsion balance vibration isolation device and method based on active suspension point control, which aims to solve the problem that the existing torsion balance system is inevitably affected by ground vibration in application, resulting in poor accuracy of torsion balance experiments.

[0004] To achieve the above objectives, on the one hand, the present invention provides a torsion balance vibration isolation device based on active suspension point control, comprising: a vacuum container, a high-precision translation stage, a displacement measurement system, and a controller;

[0005] The vacuum container is rigidly connected to the ground; the high-precision translation stage and displacement measurement system are both located inside the vacuum container; the high-precision translation stage is rigidly connected to the top of the vacuum container; the displacement measurement system is rigidly connected to the bottom of the vacuum container; the input of the controller is connected to the displacement measurement system, and its output is connected to the high-precision translation stage; when using a torsion balance for various experiments, the suspension wire in the torsion balance is connected to the center of the high-precision translation stage; the oscillator placed at the bottom of the torsion balance is located in the detection area of ​​the displacement measurement system.

[0006] Vacuum containers are used to maintain a vacuum state inside the torsion balance, reducing environmental disturbances.

[0007] The vacuum container, high-precision translation stage, and displacement measurement system vibrate synchronously with the ground.

[0008] When there is vibration on the ground, the oscillator in the torsion balance responds to the ground vibration and generates a displacement. The displacement measurement system is used to measure the displacement of the oscillator in the horizontal direction. The controller is used to drive the high-precision translation stage to move with the oscillator based on the displacement of the oscillator in the horizontal direction using control signals.

[0009] More preferably, the environmental factors that disturb the torsion balance include temperature, magnetic field, and gas molecule damping.

[0010] More preferably, the torsion balance includes a suspension wire and an oscillator; the upper end of the suspension wire is connected to a high-precision translation stage, and the lower end of the suspension wire is connected to the oscillator.

[0011] More preferably, the control signal is a voltage signal calculated based on the displacement of the oscillator in the horizontal direction, and the voltage is applied to the high-precision translation stage to generate displacement.

[0012] On the other hand, based on the torsion balance vibration isolation device based on active suspension point control provided by the present invention, the present invention provides a torsion balance vibration isolation method based on active suspension point control, comprising the following steps:

[0013] The suspension wire in the torsion balance is connected to the center of the high-precision translation stage, and a vacuum container is used to provide a vacuum state inside it to reduce environmental disturbances to the torsion balance.

[0014] When there is vibration on the ground, the oscillator in the torsion balance responds to the ground vibration and generates a displacement.

[0015] The displacement of the oscillator in the horizontal direction is measured using a displacement measurement system;

[0016] Based on the displacement of the oscillator in the horizontal direction, a high-precision translation stage is driven by a control signal to move with the oscillator.

[0017] More preferably, the environmental factors that disturb the torsion balance include temperature, magnetic field, and gas molecule damping.

[0018] More preferably, the control signal is a voltage signal calculated based on the displacement of the oscillator in the horizontal direction, and the voltage is applied to the high-precision translation stage to generate displacement.

[0019] More preferably, the torsion balance includes a suspension wire and an oscillator; the upper end of the suspension wire is connected to a high-precision translation stage, and the lower end of the suspension wire is connected to the oscillator.

[0020] In summary, compared with the prior art, the above-described technical solutions conceived by this invention have the following advantages:

[0021] Beneficial effects:

[0022] This invention provides a torsion balance vibration isolation device and method based on active suspension point control. In this device, the suspension wire in the torsion balance is connected to the center of a high-precision translation stage. The oscillator placed at the bottom of the torsion balance is located in the detection area of ​​the displacement measurement system. The displacement measurement system inputs the displacement of the torsion balance oscillator into the controller, which outputs a control signal to drive the high-precision translation stage to follow the oscillator's movement. This effectively reduces the impact of ground vibration on the sensitivity of the torsion balance system and improves the measurement level of the torsion balance system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a torsion balance vibration isolation device based on active suspension point control provided in an embodiment of the present invention;

[0024] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-vacuum container; 2-high precision translation stage; 3-torsion balance; 31-suspension wire; 32-oscillator; 4-displacement measurement system; 5-controller. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] To address the unavoidable interference from ground vibration in torsion balance experiments, the present invention aims to provide a torsion balance vibration isolation device based on active suspension point control. The device connects the suspension point of the torsion balance system to a high-precision translation stage, enabling the suspension point to follow the movement of the oscillator, thereby reducing the impact of ground vibration on the sensitivity of the torsion balance system and improving its measurement accuracy.

[0027] Example

[0028] like Figure 1 As shown, this embodiment of the invention provides a torsion balance vibration isolation device based on active suspension point control, including: a vacuum container 1, a high-precision translation stage 2 placed inside the vacuum container, a displacement measurement system 4, and a controller 5;

[0029] Vacuum container 1 is rigidly connected to the ground; high-precision translation stage 2 is rigidly connected to the top of vacuum container 1; displacement measurement system 4 is rigidly connected to the bottom of vacuum container 1; the input end of the controller is connected to the displacement measurement system, and its output end is connected to the high-precision translation stage; during operation, the suspension wire 31 in the torsion balance 3 is connected to the center of the high-precision translation stage 2; the vibrator 32 placed at the bottom of the torsion balance 3 is located in the detection area of ​​the displacement measurement system 4.

[0030] The vacuum container 1 has an electromagnetic shielding effect and can maintain a high vacuum state inside, thereby reducing the impact of environmental disturbances such as temperature, magnetic field and gas molecule damping;

[0031] Vacuum container 1, high-precision translation stage 2, and displacement measurement system 4 vibrate synchronously with the ground;

[0032] The displacement measurement system is used to measure the displacement of the oscillator 32 in two horizontal directions;

[0033] When there is ground vibration, the oscillator responds to the ground vibration and generates displacement. The displacement of the oscillator in two horizontal directions is measured by the displacement measurement system, and the displacement is input to the controller 5. The controller 5 can generate a translation stage drive signal according to the vibration isolation algorithm based on the oscillator motion information. In this embodiment, a suitable output voltage is calculated and input to the two translation directions of the high-precision translation stage. By controlling the voltage magnitude, the high-precision translation stage 2 can be driven to generate a suitable displacement. The high-precision translation stage 2 is used to drive the torsion scale to move, so as to compensate for the motion of the oscillator caused by ground vibration, thereby reducing the impact of ground vibration on the torsion scale system.

[0034] More preferably, the torsion balance includes a suspension wire 31 and an oscillator 32;

[0035] The high-precision translation stage 2 is connected to the top of the vacuum container 1. The upper end of the suspension wire 31 is connected to the high-precision translation stage 2, and the lower end is connected to the oscillator 32. The diameter of the suspension wire 31 is extremely thin, which makes the oscillator 32 very sensitive to forces or torques in the horizontal direction.

[0036] The gravity acting on the torsion balance oscillator 32 is balanced with the tension of the suspension wire. The oscillator 32 can swing and twist freely to achieve the measurement of force and torque. When the ground vibrates, the oscillator responds to the ground vibration through the suspension wire, which interferes with the measurement of force and torque.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A torsional oscillator vibration isolation device based on active control of the suspension, characterized in that include: Vacuum container (1), high-precision translation stage (2), displacement measurement system (4) and controller (5); The vacuum container (1) is rigidly connected to the ground; the high-precision translation stage (2) and the displacement measurement system (4) are both located inside the vacuum container (1); the high-precision translation stage (2) is rigidly connected to the top of the vacuum container (1); the displacement measurement system (4) is rigidly connected to the bottom of the vacuum container (1); the input end of the controller (5) is connected to the displacement measurement system (4), and its output end is connected to the high-precision translation stage (2); when using a torsion balance (3) for various experiments, the suspension wire (31) in the torsion balance (3) is connected to the center of the high-precision translation stage (2); the oscillator (32) placed at the bottom of the torsion balance (3) is located in the detection area of ​​the displacement measurement system (4); The vacuum container (1) is used to maintain its internal vacuum state and reduce environmental disturbances to the torsion balance (3); the vacuum container (1), the high-precision translation stage (2) and the displacement measurement system (4) vibrate synchronously with the ground; When there is vibration on the ground, the oscillator (32) in the torsion balance (3) generates a displacement in response to the ground vibration. The displacement measurement system (4) is used to measure the displacement of the oscillator (32) in the horizontal direction. The controller (5) is used to drive the high-precision translation stage (2) to move with the oscillator (32) according to the displacement of the oscillator in the horizontal direction using a control signal.

2. The torsional oscillator vibration isolation device of claim 1, wherein Environmental factors that disturb the torsion balance (3) include temperature, magnetic field and gas molecule damping.

3. The torsion balance vibration isolation device according to claim 1 or 2, characterized in that, The torsion balance (3) includes a suspension wire (31) and an oscillator (32); the upper end of the suspension wire (31) is connected to the high-precision translation stage (2), and the lower end of the suspension wire (31) is connected to the oscillator (32).

4. The torsion balance vibration isolation device according to claim 1, characterized in that, The control signal is a voltage signal calculated based on the displacement of the oscillator in the horizontal direction, and the voltage is applied to the high-precision translation stage to generate displacement.

5. The torsion balance vibration isolation method based on the torsion balance vibration isolation device according to claim 1, characterized in that, Includes the following steps: The suspension wire in the torsion balance is connected to the center of the high-precision translation stage (2), and the vacuum container (1) is used to provide a vacuum state inside it to reduce the disturbance of the environment to the torsion balance. When there is vibration on the ground, the oscillator in the torsion balance (3) generates displacement in response to the ground vibration; The displacement measurement system (4) is used to measure the displacement of the oscillator (32) in the horizontal direction; Based on the displacement of the oscillator (32) in the horizontal direction, the high-precision translation stage (2) is driven to move with the oscillator using a control signal.

6. The torsion balance vibration isolation method according to claim 5, characterized in that, Environmental factors that disturb the torsion balance include temperature, magnetic field, and gas molecule damping.

7. The torsion balance vibration isolation method according to claim 5 or 6, characterized in that, The control signal is a voltage signal calculated based on the displacement of the oscillator (32) in the horizontal direction, and the voltage is applied to the high-precision translation stage (2) to generate displacement.

Images